fuel line flare's

[warren57]

I am installing a pre bent 3/8" steel fuel line. The line has 45* double flare ends.
The connection on the gas tank is a standard SAE single flare 45* fitting.
Can I connect the double flare tube to it or should the double flare be removed and a single flare installed? (not enough room to double flare the tube coming out of the float assembly...)
Thanks

[chevynut]

45 degree flares are usually double flares, so I don't see an issue with what you're doing. I thought any 45 degree inverted flare fittings were for double flared tubes.

[warren57]

Yes I agree. But, the fitting on the gas tank appears to be SAE 45* flare, not inverted flare. I'm judging this from the SAE flare nut on it.
SAE flare is a single flare much like plumbing applications. Just like a 37* AN flare, only 45*.
As a double flare is 45*, it made sense to me that a double flare should seat fine?

[chevynut]

I have never seen a 45* SAE single flare. I have done a lot of work with 37* AN flares. Why do you think the gas tank fitting is a single 45* flare? Is it a stock sender?

[warren57]

It is stock, but the flare nut is (looks like) an SAE flare nut(see below). Like you would have on a nat. gas line to your stove... I've looks at several replacement senders and the fitting is sized, but not identified as what type flare. The existing fuel line attached to the fitting is a single flare?
single and double flare.jpg
SAE flare nut.jpg

[warren57]

Sent an email to Goodmark and asked them what the fitting is on their units. I'll post if they respond...

[Rick_L]

A 45? flare is a 45? flare. Double flares are usually used on steel lines because they split if they are single flared.

What you're calling a SAE 45? flare is commonly used on gas lines and air conditioning. I have seen them on automotive power steering lines on a 60s model.

The cone on a 37? fitting is much longer than the cone on a 45? fitting of the same size.

[warren57]

An update... the tank fitting is inverted flare. When someone connected the rubber hose to the tank they used a single flare not a double flare. I just need a double flare to hose adapter and everythings good...
Thanks for your comments.